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From: Willy Denoyette [MVP] on 8 Mar 2007 18:36
"Rymfax" <cwalker(a)bigbangllc.com> wrote in message
news:1173392770.192339.247990(a)8g2000cwh.googlegroups.com...
On Mar 8, 3:50 pm, "Willy Denoyette [MVP]"
<willy.denoye...(a)telenet.be> wrote:
> "Rymfax" <cwal...(a)bigbangllc.com> wrote in message
>
> news:1173384460.483366.285820(a)p10g2000cwp.googlegroups.com...
>
>
> Your struct should look like this (partly):
>
> [StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Unicode)] <-----1
> public struct SP_DRVINFO_DATA
> {
> public int cbSize;
> public int DriverType;
> public IntPtr Reserved;
> ...
>
> read more �- Hide quoted text -
>
> - Show quoted text -

Willy, You are a GOD among men!!!!

Do you think you could explain to me what the Pack = 4 does and why I
need it for this structure but not any of my others?

The problem is with this:

public System.Runtime.InteropServices.ComTypes.FILETIME DriverDate;
public ulong DriverVersion;
}
DriverDate, being a long (8 bytes) will be aligned at its natural boundary with the default
packing (Pack = 0), that means that it will be stored at a address which is a multiple of 8.
However, if you look at the preceeding fields, DriverDate would not end on such an address,
so, the lay-out manager will pad the preceeding field with 4 bytes (the fixed char array),
and as such render the struct incompatible (both in length and some field addresses) with
what the function is expecting.
When setting the Packing to 4 (the same as used in the header file) , no such padding is
done and the struct length corresponds to what the function expects.


Thanks! Would you like my first born? He's yours! :)

Wow, but thanks, too much honor really ;-).

Willy.



From: Rymfax on 8 Mar 2007 18:41
Willy,

Would love your help one more time please! I'm now trying to get
SetupDiGetDriverInfoDetail to work. I'm getting the same 1784L
error. I was hoping you could take a look again. My struct/invoke/
code is below. The new snippet of code is just being run insde the
while loop of the previous code. Thanks! Oh, and FYI, I tried this
struct with and without the Pack=4.


[StructLayout(LayoutKind.Sequential, Pack=4, CharSet =
CharSet.Unicode)]
public struct SP_DRVINFO_DETAIL_DATA
{
public int cbSize;
public System.Runtime.InteropServices.ComTypes.FILETIME
InfDate;
public int CompatIDsOffset;
public int CompatIDsLength;
public ulong Reserved;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
public string SectionName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string InfFileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
public string DrvDescription;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
public string HardwareID;
}

[DllImport("setupapi.dll", SetLastError = true, CharSet =
CharSet.Unicode)]
private static extern bool SetupDiGetDriverInfoDetail(IntPtr
DeviceInfoSet,
ref SP_DEVINFO_DATA DeviceInfoData, ref SP_DRVINFO_DATA
DriverInfoData,
ref SP_DRVINFO_DETAIL_DATA DriverInfoDetailData, int
DriverInfoDetailDataSize,
ref int RequiredSize);

// New Code Snipped

string infPath = "";
int drvRank = 0;
SP_DRVINSTALL_PARAMS drvParams = new
SP_DRVINSTALL_PARAMS();
drvParams.cbSize =
Marshal.SizeOf(typeof(SP_DRVINSTALL_PARAMS));
if (SetupDiGetDriverInstallParams(devInfoSet, ref
devInfoData, ref drvData, ref drvParams))
{
drvRank = drvParams.Rank;
}
int dataSize = 2048;
SP_DRVINFO_DETAIL_DATA drvInfDetail = new
SP_DRVINFO_DETAIL_DATA();
drvInfDetail.cbSize =
Marshal.SizeOf(typeof(SP_DRVINFO_DETAIL_DATA));
if (!SetupDiGetDriverInfoDetail(devInfoSet, ref
devInfoData, ref drvData, ref drvInfDetail,
dataSize, ref dataSize))
{
int didErr = Marshal.GetLastWin32Error();
infPath = "blah";
}
memIndex++;
enumResult = SetupDiEnumDriverInfo(devInfoSet, ref
devInfoData, SPDIT_COMPATDRIVER,
memIndex, ref drvData);

From: Willy Denoyette [MVP] on 8 Mar 2007 19:12
"Rymfax" <cwalker(a)bigbangllc.com> wrote in message
news:1173397264.560680.9230(a)30g2000cwc.googlegroups.com...
> Willy,
>
> Would love your help one more time please! I'm now trying to get
> SetupDiGetDriverInfoDetail to work. I'm getting the same 1784L
> error. I was hoping you could take a look again. My struct/invoke/
> code is below. The new snippet of code is just being run insde the
> while loop of the previous code. Thanks! Oh, and FYI, I tried this
> struct with and without the Pack=4.
>
>
> [StructLayout(LayoutKind.Sequential, Pack=4, CharSet =
> CharSet.Unicode)]
> public struct SP_DRVINFO_DETAIL_DATA
> {
> public int cbSize;
> public System.Runtime.InteropServices.ComTypes.FILETIME
> InfDate;
> public int CompatIDsOffset;
> public int CompatIDsLength;
> public ulong Reserved;


public IntPtr Reserved;

Note, as I said previously, I didn't check the other structs for packing issues and the
like. You really have to check the header files before defining your interop stucts (or stay
with C++ :-)).


Willy.

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